Table of Contents
Internal diagram and time diagram of the programming mechanisms
LGB21...
a
br
b
AS
ar
I
a
b
a
AR
a
b a b
II
VIII
MS
EK1
L1
2 10
8
EK2
AL
A
I b a
b
a
tw
t10
b
IV
a
b
V
a
b
VI
a
b
VII
a
b
VIII
a
b
IX
a
b
AR
a
b
FR
a
Building Technologies
HVAC Products
GP/
W
R
SB
12
M
1)
3
b
a
b
IV
FR
fr
b
a
V
VI
IX
VII
b
a
a
b
a
a
b
4
5
7
BV1
BV2
Dbr1
Z
B
t1
t3
TSA
t4
2)
T = 81 s (40,5 s
)
L N
Legend
HS
0 I
AL
Alarm
AR
Load relay with contact «ar»
AS
Unit fuse
BR
Locking relay with contact «br»
LP
BV...
Fuel valve
Dbr1
Wire link
11
6
EK...
Lockout reset button
FR
Flame relay
GP
Gas pressure switch
HS
Mains isolator
ION
Ionization probe
L1
Lockout warning lamp
LP
Air pressure switch
M
Fan motor
MS
Synchronous motor
R
Control thermostat or pressurestat
SB
Safety limit thermostat
9 1
W
Limit thermostat or pressure switch
ION
Z
Ignition transformer
A
Start position (switching on)
C
B
Operating position of burner
C
Operating position of programming mechanism or start
position
I...IX
Cam switches
tw
Waiting time
t20
TSA
Ignition safety time
T
Total running time of programming mechanism
t1
Prepurge time
4
t3
Preignition time
t4
Interval «BV1 – BV2»
7
t10
Specified time for air pressure signal
t20
Interval up to self-shutdown of programming
mechanism
5
1)
Resistance between terminal 3 and «N» must not
exceed 1.6 k Ω
3
2)
Only with LGB21.130A27
19/22
CC1N7435en
11.01.2007
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